feat: Phase 2 complete — calls, media, spaces, persistence, chat improvements

- LiveKit/MatrixRTC voice+video calls with full call screen UI
- Incoming call overlay (accept/decline)
- Media upload/download — file picker, image rendering, file download
- Spaces navigation — space list + expandable child rooms
- Drift persistence — rooms + messages written on every sync
- Sync persistence auto-starts on login and session restore
- Chat: typing indicators, long-press menu, reply, emoji reactions
- User search dialog + start DM from rooms screen
- Android: INTERNET + CAMERA + RECORD_AUDIO permissions in main manifest
- Emoji picker for reactions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/core/auth/auth_notifier.dart

@@ -1,4 +1,4 @@
-// Version: 1.0.0 | Created: 2026-04-01
+// Version: 1.1.0 | Created: 2026-04-01
 // Riverpod notifier that owns the auth state machine.
 // All login/logout/session-restore transitions go through here.
 
@@ -6,6 +6,7 @@ import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 import '../../features/auth/data/auth_repository.dart';
 import '../../features/auth/domain/auth_failure.dart';
+import '../storage/sync_persistence_service.dart';
 import 'auth_state.dart';
 import 'secure_storage.dart';
 
@@ -48,6 +49,9 @@ class AuthNotifier extends _$AuthNotifier {
         accessToken: credentials.accessToken,
         deviceId: credentials.deviceId,
       );
+
+      // Resume background persistence for the restored session.
+      ref.read(syncPersistenceServiceProvider).start();
     } on AuthFailure {
       // Stored credentials are invalid; force re-login.
       await storage.clearCredentials();
@@ -84,6 +88,9 @@ class AuthNotifier extends _$AuthNotifier {
         accessToken: response.accessToken,
         deviceId: response.deviceId,
       );
+
+      // Start background sync-to-database persistence now that we are logged in.
+      ref.read(syncPersistenceServiceProvider).start();
     } on AuthFailure catch (failure) {
       state = AuthState.unauthenticated(failure: failure.userMessage);
     }